Composite Sr- and V-doped LaCrO3/YSZ sensor electrode operating at low oxygen levels

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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@article{ba1ead27889a414095c4827cfba957a8,
title = "Composite Sr- and V-doped LaCrO3/YSZ sensor electrode operating at low oxygen levels",
keywords = "Electrochemistry, Conversion impedance, Lanthanium chromites, Reaction-mechanism, Identification, Cathodes, Behavior",
publisher = "Springer",
author = "Anders Lund and Torben Jacobsen and Hansen, {Karin Vels} and Mogensen, {Mogens Bjerg}",
year = "2012",
doi = "10.1007/s10008-011-1601-7",
volume = "16",
number = "6",
pages = "2113--2120",
journal = "Journal of Solid State Electrochemistry",
issn = "1432-8488",

}

RIS

TY - JOUR

T1 - Composite Sr- and V-doped LaCrO<sub>3</sub>/YSZ sensor electrode operating at low oxygen levels

A1 - Lund,Anders

A1 - Jacobsen,Torben

A1 - Hansen,Karin Vels

A1 - Mogensen,Mogens Bjerg

AU - Lund,Anders

AU - Jacobsen,Torben

AU - Hansen,Karin Vels

AU - Mogensen,Mogens Bjerg

PB - Springer

PY - 2012

Y1 - 2012

N2 - <p>A porous composite electrode of La<sub>0.8</sub>Sr<sub>0.2</sub>Cr<sub>0.97</sub>V<sub>0.03</sub>O<sub>3 -delta</sub> (LSCV) and yttria-stabilised zirconia (YSZ) was evaluated as a possible candidate for high-temperature potentiometric oxygen sensor measuring electrodes. The oxygen processes at the electrode were characterised by performing electrochemical impedance spectroscopy (EIS) measurements between 600º C and 900º C at oxygen partial pressures between 4.2x10<sup>-6</sup> and 0.2 bar. The microstructure of the electrode was characterised by electron microscopy. The LSCV/YSZ electrode was porous and coherent with LSCV and YSZ grain sizes between 200 and 400 nm. At oxygen partial pressures around 0.2 bar at 700º C, the oxygen reaction is dominated by solid-state diffusion of oxide ions and surface reaction kinetics. At oxygen partial pressures around 10<sup>-5</sup> bar above 800º C, gas phase mass transport processes dominate the impedance spectra. The relatively low response time at 700º C at an oxygen partial pressure of around 5x10<sup>-6</sup> bar and an inlet gas flow rate of 8 L h<sup>-1</sup> makes the LSCV/YSZ electrode suitable for use as an potentiometric oxygen sensor electrodes.</p>

AB - <p>A porous composite electrode of La<sub>0.8</sub>Sr<sub>0.2</sub>Cr<sub>0.97</sub>V<sub>0.03</sub>O<sub>3 -delta</sub> (LSCV) and yttria-stabilised zirconia (YSZ) was evaluated as a possible candidate for high-temperature potentiometric oxygen sensor measuring electrodes. The oxygen processes at the electrode were characterised by performing electrochemical impedance spectroscopy (EIS) measurements between 600º C and 900º C at oxygen partial pressures between 4.2x10<sup>-6</sup> and 0.2 bar. The microstructure of the electrode was characterised by electron microscopy. The LSCV/YSZ electrode was porous and coherent with LSCV and YSZ grain sizes between 200 and 400 nm. At oxygen partial pressures around 0.2 bar at 700º C, the oxygen reaction is dominated by solid-state diffusion of oxide ions and surface reaction kinetics. At oxygen partial pressures around 10<sup>-5</sup> bar above 800º C, gas phase mass transport processes dominate the impedance spectra. The relatively low response time at 700º C at an oxygen partial pressure of around 5x10<sup>-6</sup> bar and an inlet gas flow rate of 8 L h<sup>-1</sup> makes the LSCV/YSZ electrode suitable for use as an potentiometric oxygen sensor electrodes.</p>

KW - Electrochemistry

KW - Conversion impedance

KW - Lanthanium chromites

KW - Reaction-mechanism

KW - Identification

KW - Cathodes

KW - Behavior

U2 - 10.1007/s10008-011-1601-7

DO - 10.1007/s10008-011-1601-7

JO - Journal of Solid State Electrochemistry

JF - Journal of Solid State Electrochemistry

SN - 1432-8488

IS - 6

VL - 16

SP - 2113

EP - 2120

ER -